This report describes the capability of two facile, sensitive and concentrative methods for quantification of sub‐ppm levels of copper in different solutions using octadecyl silica bonded phase membrane (OSPM) disks. The first standpoint is based on introduction a homogenized miscellaneous solution of copper‐1‐(2‐pyridylazo)‐2‐naphtol (PAN) to the surface of an OSPM disk. The second perspective is the usual manner and is performed by impregnation or modification of the sorbent surface. All the affecting experimental variables such as pH, amount of modifier, eluent type, concentration of each metal and ligand, surfactant type, sample and eluent flow‐rate, time and disk capacity are also tested. The results reveal that the first way is considerably more time consuming. However, the second method possesses high break‐through volume (2000 mL) and lower detection limit (0.01 ng mL−1). Both the methods have been successfully applied for isolation and determination of trace copper in different aqueous and real samples.
A very selective, reliable and precise method for rapid separation of the trace amounts of copper in aqueous samples using octadecyl silica bonded phase membrane disks modified by N,N -ethylene-bis-(3-formyl-5-methyl salicyl aldymine) combined with flame atomic absorption spectrometric determination has been established. All the affecting experimental variables such as pH, amount of modifier, eluent type, sample and eluent flow-rate, foreign ions and disk capacity were also investigated. The target analyte (trace copper) was quantitatively retained at pH=4, and eluted with 8 mL of HCl (1M) and HNO 3 0.5 M each containing 2.0% (v/v) methanol applying flow rates of 50 mL min -1 and 15 mL min -1 for sample introduction and elution steps, respectively. The proposed method exhibits a wide linear dynamic range over 5-150 ng mL -1 and reproducibility at the most 3%. It also permits an enrichment factor of about 400 or higher and a detection limit of 0.005 ng mL -1 . The method has been successfully applied for isolation and determination of copper in different aqueous, real samples, peppers and standard alloys.
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